Materials Literature
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Most antiferroelectric ceramics are modified from the prototype ${\mathrm{PbZrO}}_{3}$ by adding Sn and Ti in conjunction with small amount of Nb or La to optimize their properties. These modifiers introduce unique nanoscale structural feature to the ceramics in the form of incommensurate modulations. It was shown pre…
Salen's lot: Meerwein–Ponndorf–Verley reduction of [Ti(salen)(OiPr)2] (salen=bis(salicylidene)ethylenediaminato) complexes followed by treatment with water leads to the synthesis of pseudo-heterochiral and homochiral di-μ-oxotitanium dimers. These dimers, in particular (aR,S,Δ, aR,S,Δ)-dimer 1, efficiently catalyze th…
Intrinsic defects produced in ZnO by 2.5-MeV electron irradiation in situ at 4.2 K are studied by optical detection of electron paramagnetic resonance (ODEPR). Observed in the photoluminescence (PL) are ODEPR signals, which are identified with the oxygen vacancy, ${\mathrm{V}}_{\mathrm{O}}^{+}$, interstitial zinc, ${\…
The efficiency of various silver-based antimicrobial fillers (elementary silver and silver substituted materials) in polyamide (PA) toward their silver ion (Ag+) release characteristics in an aqueous medium was investigated and discussed. Anode stripping voltammetry (ASV) was used for the quantitative estimation of Ag…
Tunneling spectroscopy measurements have been carried out on a single molecule device formed by two Pd nanocrystals (dia, $\sim$5 nm) electronically coupled by a conducting molecule, dimercaptodiphenylacetylene. The I-V data, obtained by positioning the tip over a nanocrystal electrode, exhibit negative differential r…
We calculated the influence of surface tension on the barriers of oxygen ionic conductivity in nanograin ceramics. Activation energy of oxygen ions diffusion via oxygen vacancies which were considered as the dilatational centers was calculated. This energy was shown to decrease with nanoparticle sizes decreasing. The…
Meet on the edge: The relative concentration of corner and edge ions in a cubelike nanoparticle critically depends on the size of the nanoparticle. On MgO nanocubes this ratio is reflected by their optical properties (see picture).
New nanocomposite films were prepared with atactic polypropylene as the matrix and either of three types of cellulose whiskers, with various surface and dispersion characteristics, as the reinforcing phase: aggregated without surface modification, aggregated and grafted with maleated polypropylene or individualized an…
An aqueous surfactant-based colloidal chemical method is reported for the synthesis of anisotropic noble-metal nanoparticles on the milligram to multigram scale. Fine control of the nucleation-growth kinetics and rodlike micelle-induced breaking of symmetry at the early stage of particle growth are responsible for hig…
Carbon nanotubes are usually made up of $^{12}\mathrm{C}$ atoms. By adopting the force constant model, the effects of isotope doping with $^{13}\mathrm{C}$ on the vibrational, optical, and thermal properties of single-walled carbon nanotubes are theoretically investigated, including the phonon eigenmodes and density o…
We consider the orbital ordering in ${\mathrm{LaMnO}}_{3}$ and similar systems, proceeding from the band picture. We show that for a realistic magnetic structure of $A$ type there exists a complete nesting between two ${e}_{g}$ bands. As a result there occurs an instability toward an excitonic insulatorlike state---an…
Molecular units Molecular recognition Cell adhesion Whole- cell censor structures Bio-hybrid silica-based materials Biomineralization Self- assembly
We calculate structural and electronic properties of ${\mathrm{CaCu}}_{3}{\mathrm{Ti}}_{4}{\mathrm{O}}_{12}$ from ambient pressure up to 10.0 GPa using total-energy first-principles methods. Analysis of the simulated high-pressure structure suggests a pressure-induced structural phase transition between 3 and 4 GPa wi…
Thermoelectric air-conditioners (TEACs) are becoming much concerned due to their many advantages, but the low COPs limit their broad applications. The two key factors to raise the COPs of TEACs are both the improvement of thermoelectric materials and the optimum design of hot side heat sinks. This paper provides a the…
Metal-insulator transitions strongly coupled with lattice were found in ${\mathrm{Bi}}_{1\ensuremath{-}x}{\mathrm{La}}_{x}{\mathrm{NiO}}_{3}$. Synchrotron x-ray powder diffraction revealed that pressure ($P\ensuremath{\sim}3\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$, $T=300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$), temper…
Self-absorption and radiation trapping in Er3 + -doped TeO2-based glasses, M. Mattarelli, M. Montagna, L. Zampedri, A. Chiasera, M. Ferrari, G. C. Righini, L. M. Fortes, M. C. Gonçalves, L. F. Santos, R. M. Almeida
BACKGROUND: The availability of suitable recombinant protein is still a major bottleneck in protein structure analysis. The Protein Structure Factory, part of the international structural genomics initiative, targets human proteins for structure determination. It has implemented high throughput procedures for all step…
We performed high pressure resonant Raman experiments on well characterized purified single-wall carbon nanotubes up to $40\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ using argon as pressure transmitting medium. We used two different excitating wavelengths, at $632.8\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ and $514.5\phan…
Chitosan, the N-deacetylated derivative of chitin, is a potential biopolysaccharide owing to its specific structure and properties. In this paper, we report on the synthesis of 24 new chitosan derivatives, N-alkyl chitosans (NAC) and N-benzyl chitosans (NBC), that are soluble in dilute aqueous acetic acid. The differe…
Effect of hydrostatic pressure and magnetic field on electrical resistance of the Kondo-like perovskite manganese oxide, La$_{0.1}$Ce$_{0.4}$Sr$_{0.5}$MnO$_3$ with a ferrimagnetic ground state, have been investigated up to 2.1 GPa and 9 T. In this compound, the Mn-moments undergo double exchange mediated ferromagnetic…